The motor and drivetrain. I could never get an ESC to handle any real power.... Fine on stock 6cell and 550 motors, but when I upgraded to 14 turn quad wind and two 8 cell batts, I kept frying wiring harnesses and ESC. Gets expensive quick. Weed wacker motors are so reliable. WOT every time out and she starts first pull.
I doubt the hull could take 130.